Bierman, P., (2015) The incision history of the Great Falls of the Potomac River—The Kirk Bryan 2015 field trip, in Brezinski, D.K., Halka, J.P., and Ortt, R.A, Jr., eds., Tripping from the Fall Line. Geological Society of
Field Guide 40, doi:10.1130/2015.0040(01). p.1-10.(download pdf)(see video of the trip)